US7368949B2 - Output driver and output driving method for enhancing initial output data using timing - Google Patents
Output driver and output driving method for enhancing initial output data using timing Download PDFInfo
- Publication number
- US7368949B2 US7368949B2 US11/561,765 US56176506A US7368949B2 US 7368949 B2 US7368949 B2 US 7368949B2 US 56176506 A US56176506 A US 56176506A US 7368949 B2 US7368949 B2 US 7368949B2
- Authority
- US
- United States
- Prior art keywords
- data
- output
- selection signal
- input data
- logic state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
- G11C7/1066—Output synchronization
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
- G11C7/1069—I/O lines read out arrangements
Definitions
- the present invention relates to a data output driver and output driving method, and more particularly to an output driver and output driving method, which compensate for the attenuation of transmission data during data communication.
- Transmission data generated by a transmission device is transmitted to a reception device through a transmission line.
- the transmission device is typically provided with an output driver for outputting the transmission data.
- Transmission data is composed of a plurality of data bits to be consecutively transmitted.
- the phenomenon due to the previous data bit, may be referred to as Inter-Symbol Interference (hereinafter referred to as “ISI”). Due to ISI, attenuation of transmission data may occur.
- the ISI may further increase when the data bit having the logic state differing from that of the previous data bit is transmitted immediately after several data bits having the same logic state have been transmitted.
- FIG. 1 is a diagram showing an example of an output driver.
- FIG. 2 is a timing diagram showing the signals of the output driver of FIG. 1 .
- a bit shifter 11 shifts input data IDAT 1 by one bit period and generates shifted data SDAT 1 .
- a data adder 13 performs an operation of Equation [1] and generates output data ODAT 1 , V ( ODAT 1) ⁇ a*V ( SDAT 1) [1] where V(ODAT 1 ), V(IDAT 1 ) AND V(SDAT 1 ) denote the voltage levels of the output data ODAT 1 , the input data IDAT 1 and the shifted data SDAT 1 , respectively. Further, “a” denotes a positive constant.
- the swing range of one bit value increases whenever the logic state of the output data ODAT 1 is transitioned. Therefore, the attenuation of the output data ODAT 1 is mitigated due to the increasing swing range.
- FIG. 3 is a diagram showing another example of an output driver.
- FIG. 4 is a timing diagram showing the signals of the output driver of FIG. 3 .
- a delay unit 21 delays input data IDAT 2 and generates delayed data DDAT 2 .
- the initial voltage level of the output data ODAT 2 is intensified whenever the logic state of the output data ODAT 2 is transitioned.
- the attenuation of the output data ODAT 2 is mitigated due to the intensified initial voltage level.
- the input data IDAT 1 and IDAT 2 and the output data ODAT 1 and ODAT 2 operate at a high voltage higher than a voltage level Vh in a logic H state, and at a low voltage lower than a voltage level V1 in a logic L state.
- the output drivers of FIGS. 1 and 3 need to include circuits for generating the high voltage and the low voltage.
- an output driver for generating output data comprises a selection signal generation unit for generating a selection signal based on input data having consecutively valid data bits during a plurality of consecutive bit periods, the selection signal being activated at a transition point of the input data, generated after being maintained in a same logic state during a number of bit periods that is equal to or greater than a predetermined duration number.
- the output driver comprises a reference data generation unit for delaying the input data by a delay time shorter than one bit period, and generating reference data, and a selection unit, electrically coupled to the selection signal generation unit and the reference data generation unit, driven to transition a logic state of the output data depending on a transition of a logic state of any one of the input data and the reference data in response to the selection signal.
- an output driving method of generating output data comprises generating a selection signal based on input data having a plurality of consecutive data bits, the selection signal being activated at a transition point of the input data, the transition point generated after the input data has been maintained in a same logic state during a number of bit periods that is equal to or greater than a predetermined duration number, generating reference data as the input data delayed by a delay time shorter than one bit period, and transitioning a logic state of the output data depending on a transition of a logic state of any one of the input data and the reference data in response to the selection signal.
- FIG. 1 is a diagram showing an example of a conventional output driver
- FIG. 2 is a timing diagram showing the principal signals of the output driver of FIG. 1 ;
- FIG. 3 is a diagram showing another example of a conventional output driver
- FIG. 4 is a timing diagram showing the principal signals of the output driver of FIG. 3 ;
- FIG. 5 is a diagram showing an output driver according to an embodiment of the present invention.
- FIG. 6 is a timing diagram showing the principal signals of the output driver of FIG. 5 ;
- FIG. 7 is a graph showing the effect of the output driver according to an embodiment of the present invention.
- FIG. 5 is a diagram showing an output driver 100 according to an embodiment of the present invention.
- FIG. 6 is a timing diagram showing signals of the output driver 100 of FIG. 5 .
- Reference character CLK denotes a clock signal used to indicate a bit period pBIT.
- the output driver 100 drives output data ODAT corresponding to input data IDAT.
- the input data IDAT has consecutively valid data bits for a plurality of consecutive bit periods.
- a single data bit is assigned to a single bit period pBIT.
- the output driver 100 includes a selection signal generation unit 110 , a reference data generation unit 130 and a selection unit 150 .
- the selection signal generation unit 110 receives the input data IDAT, and generates a selection signal /TX based on the input data IDAT.
- the selection signal /TX is activated to a logic L state at the transition point of the input data IDAT, generated after being maintained in the same logic state for a number of bit periods that is equal to or greater than a predetermined duration number, e.g., 2.
- the selection signal generation unit 110 includes a bit shifter 111 and a logic operation means 113 .
- the bit shifter 111 delays the received input data IDAT by one bit period pBIT.
- the shifted data SDAT output from the bit shifter 111 is shifted from the input data IDAT by one bit period, as shown in FIG. 6 .
- the logic operation means 113 performs a logic operation on the input data IDAT and the shifted data SDAT, thus generating the selection signal /TX.
- the logic operation means 113 is an Exclusive-OR logic gate for performing an Exclusive-OR operation on the input data IDAT and the shifted data SDAT. In an interval during which the input data IDAT and the shifted data SDAT have the same logic state, the selection signal /TX is transitioned to a logic L state. Further, in an interval during which the input data IDAT and the shifted data SDAT have different logic states, the selection signal /TX is transitioned to a logic H state.
- the transition of the logic state of the selection signal /TX occurs after being delayed from that of the input data IDAT or the shifted data SDA by a predetermined period (each “pd” in FIG. 6 ).
- the selection signal /TX is activated to a logic L state.
- the selection signal /TX is deactivated to a logic H state.
- the reference data generation unit 130 delays the input data IDAT by a predetermined delay time (refer to td in FIG. 6 ), thus generating reference data RDAT.
- the delay time td is shorter than the bit period pBIT.
- the selection unit 150 generates output data ODAT that is transitioned depending on the transition of the logic state of any one of the input data IDAT and the reference data RDAT in response to the selection signal /TX.
- the transition of the logic state of the output data ODAT follows the transition of the input data IDAT.
- the logic state of the output data ODAT is also transitioned to a logic H state in response to the transition of the input data IDAT to a logic H state (refer to t 6 and t 7 in FIG. 6 ).
- the logic state of the output data ODAT is also transitioned to a logic L state in response to the transition of the input data IDAT to a logic L state (refer to time t 8 in FIG. 6 ).
- the transition of the logic state of the output data ODAT follows the transition of the reference data RDAT.
- the logic state of the output data ODAT is also transitioned to a logic H state in response to the transition of the reference data RDAT to a logic H state (refer to t 9 in FIG. 6 ).
- the logic state of the output data ODAT is transitioned to a logic L state in response to the transition of the reference data RDAT to a logic L state (refer to t 10 and t 11 in FIG. 6 ).
- the logic state of the output data ODAT is transitioned in response to the input data IDAT. As shown in FIG. 6 , the logic state of the output data ODAT is transitioned earlier than the reference data RDAT by the delay time td. Accordingly, the attenuation of data that may occur in the output data ODAT can be mitigated.
- the logic state of the input data IDAT is transitioned at each bit period, the logic state of the output data ODAT is transitioned depending on the reference data RDAT; the output data ODAT is not transitioned in advance.
- Such an operation is performed in consideration of the fact that the attenuation of transmission data is relatively low when the logic state of the transmission data is transitioned at each bit. In this case, a period secured for data that is transitioned at each bit can be sufficiently assigned as one bit period.
- FIG. 7 is a graph showing the effect of the output driver according to an embodiment of the present invention. As shown in FIG. 7 , the logic state of the output data ODAT is transitioned in advance in response to the input data IDAT, not the reference data RDAT. The eye window of the output data ODAT increases compared to that of the case where the enhancement of initial data is not performed.
- the input data IDAT and the output data ODAT are not needed to be driven to a voltage level higher than the voltage level Vh in a logic H state, nor a voltage level lower than the voltage level Vl in a logic L state, so as to enhance the initial input or output data.
- the output driver and output driving method according to an embodiment of the present invention cause the transition of the logic state of the output data ODAT in advance of the reference data RDAT, thus generating an effect similar to the enhancement of initial data. Therefore, the output driver does not require circuits for generating a high voltage higher than a typical high voltage level nor a low voltage lower than a typical low voltage level.
- output data is generated by the selection unit. Therefore, the capacitance of the output stage of the output driver decreases compared to the conventional output drivers in FIGS. 1 and 3 .
- the duration number is 2.
- the number of bit periods shifted by the bit shifter and/or the construction of a logic operation means are changeable, so that the duration number can be changed to, for example, 1, or a number equal to or greater than 3.
Abstract
Description
V(ODAT1)−a*V(SDAT1) [1]
where V(ODAT1), V(IDAT1) AND V(SDAT1) denote the voltage levels of the output data ODAT1, the input data IDAT1 and the shifted data SDAT1, respectively. Further, “a” denotes a positive constant.
V(ODAT2)=V(IDAT2)−b*V(DDAT2) [2]
where V(ODAT2, V(IDAT2) and V(DDAT2) denote the voltage levels of the output data ODAT2, the input data IDAT2 and the delayed data DDAT2, respectively. Further, “b” denotes a positive constant.
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2005-110518 | 2005-11-18 | ||
KR1020050110518A KR100666179B1 (en) | 2005-11-18 | 2005-11-18 | Output driver and output driving method for preemphasis in output data with timing |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070115752A1 US20070115752A1 (en) | 2007-05-24 |
US7368949B2 true US7368949B2 (en) | 2008-05-06 |
Family
ID=37867306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/561,765 Active US7368949B2 (en) | 2005-11-18 | 2006-11-20 | Output driver and output driving method for enhancing initial output data using timing |
Country Status (4)
Country | Link |
---|---|
US (1) | US7368949B2 (en) |
JP (1) | JP4964566B2 (en) |
KR (1) | KR100666179B1 (en) |
DE (1) | DE102006054999B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6623798B2 (en) | 2016-02-02 | 2019-12-25 | 富士通株式会社 | Light emitting element drive circuit |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6064356A (en) * | 1996-10-22 | 2000-05-16 | Pioneer Electronics Corporation | Driving system for a self-luminous display |
US6185716B1 (en) * | 1998-01-30 | 2001-02-06 | Maxtor Corporation | Dual detector read channel with semi-soft detection |
KR20020083329A (en) | 2001-04-27 | 2002-11-02 | 주식회사 하이닉스반도체 | Cmos output driving circuit |
JP2002368600A (en) | 2001-06-08 | 2002-12-20 | Mitsubishi Electric Corp | Pre-emphasis circuit |
US20030099310A1 (en) * | 1999-05-12 | 2003-05-29 | Zoran Zvonar | Method for correcting DC offsets in a receiver |
JP2003243940A (en) | 2002-01-21 | 2003-08-29 | Evolium Sas | Method and apparatus for preparing signals compared at pre-emphasis setting at input of amplifier |
US7126394B2 (en) * | 2004-05-17 | 2006-10-24 | Micron Technology, Inc. | History-based slew rate control to reduce intersymbol interference |
US7277499B2 (en) * | 2002-02-01 | 2007-10-02 | Nxp B.V. | Additive DC component detection included in an input burst signal |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002039629A2 (en) * | 2000-10-31 | 2002-05-16 | Igor Anatolievich Abrosimov | Channel time calibration means |
-
2005
- 2005-11-18 KR KR1020050110518A patent/KR100666179B1/en active IP Right Grant
-
2006
- 2006-11-15 JP JP2006309616A patent/JP4964566B2/en active Active
- 2006-11-17 DE DE102006054999A patent/DE102006054999B4/en active Active
- 2006-11-20 US US11/561,765 patent/US7368949B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6064356A (en) * | 1996-10-22 | 2000-05-16 | Pioneer Electronics Corporation | Driving system for a self-luminous display |
US6185716B1 (en) * | 1998-01-30 | 2001-02-06 | Maxtor Corporation | Dual detector read channel with semi-soft detection |
US20030099310A1 (en) * | 1999-05-12 | 2003-05-29 | Zoran Zvonar | Method for correcting DC offsets in a receiver |
KR20020083329A (en) | 2001-04-27 | 2002-11-02 | 주식회사 하이닉스반도체 | Cmos output driving circuit |
JP2002368600A (en) | 2001-06-08 | 2002-12-20 | Mitsubishi Electric Corp | Pre-emphasis circuit |
JP2003243940A (en) | 2002-01-21 | 2003-08-29 | Evolium Sas | Method and apparatus for preparing signals compared at pre-emphasis setting at input of amplifier |
US7277499B2 (en) * | 2002-02-01 | 2007-10-02 | Nxp B.V. | Additive DC component detection included in an input burst signal |
US7126394B2 (en) * | 2004-05-17 | 2006-10-24 | Micron Technology, Inc. | History-based slew rate control to reduce intersymbol interference |
Non-Patent Citations (3)
Title |
---|
English Abstract for Publication No.: 1020020083329, filing date: Apr. 27, 2001, pub date: Nov. 2, 2002. |
English Abstract for Publication No.: JP2002368600, pub date: Dec. 20, 2002. |
English Abstract for Publication No.: JP2003243940, pub date: Aug. 29, 2003. |
Also Published As
Publication number | Publication date |
---|---|
DE102006054999B4 (en) | 2011-12-15 |
JP4964566B2 (en) | 2012-07-04 |
US20070115752A1 (en) | 2007-05-24 |
KR100666179B1 (en) | 2007-01-09 |
DE102006054999A1 (en) | 2007-07-19 |
JP2007143159A (en) | 2007-06-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7391238B2 (en) | Semiconductor memory device having pre-emphasis signal generator | |
US7701257B2 (en) | Data receiver and semiconductor device including the data receiver | |
US9722582B2 (en) | Semiconductor device with output driver pre-emphasis scheme | |
US8630336B2 (en) | Partial response receiver and related method | |
US9203606B2 (en) | Clock recovery circuit, data receiving device, and data sending and receiving system | |
US8362996B2 (en) | Display with CLK phase auto-adjusting mechanism and method of driving same | |
US20100117702A1 (en) | Duty cycle correction apparatus and semiconductor integrated circuit having the same | |
US7545164B2 (en) | Output driver for controlling impedance and intensity of pre-emphasis driver using mode register set | |
KR101839884B1 (en) | Semiconductor device | |
KR20090024444A (en) | Receiver circuit | |
US8604830B2 (en) | Semiconductor device | |
KR100640593B1 (en) | Output driver circuit with cascaded pre-emphasis function | |
US10944600B2 (en) | Data transmission circuit | |
US20080191763A1 (en) | Clock control circuit and semiconductor integrated circuit using the same | |
US7368949B2 (en) | Output driver and output driving method for enhancing initial output data using timing | |
KR102021336B1 (en) | Semiconductor device and operating methode for the same | |
KR20070109418A (en) | Serial transmitter with pre-emphasis | |
KR20090039295A (en) | Data transfer circuit | |
US7830166B2 (en) | Pulse shift modulation for reducing cross-talk of single ended I/O interconnects | |
US8243868B2 (en) | Method and apparatus for duty cycle pre-distortion and two-dimensional modulation | |
KR102271075B1 (en) | Signal receiving circuit and method for adjusting weight of compensator | |
US7221182B2 (en) | Open drain type output buffer | |
US6384661B1 (en) | Multi level jitter pre-compensation logic circuit for high speed data links | |
KR100524947B1 (en) | Open drain output buffer | |
KR20060058841A (en) | Output driver controlling slew rate in designated region of output signal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SAMSUNG ELECTRONICS CO., LTD, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SOHN, YOUNG-SOO;CHOI, JUNG-HWAN;REEL/FRAME:018829/0577;SIGNING DATES FROM 20061227 TO 20070117 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 12 |